Bovada 2/4 straight OTR gets shoved on

UTG is a passive fish who limps, BTN makes it 16 (no reads) I call in BB with T8s. UTG calls.

Flop (47) 77J r, checks through.

Turn (47) 3 r, I bet 34 UTG calls and BTN calls.

River (150) 9, I bet 122, UTG calls, BTN shoves for 344 total, hero?

Think this is standard till river. OTR V is repping 99 or JJ. However, if he can have JJ think it’s reasonable to add some A7 type hands into his range. Not sure if V is aware that UTG is a bit of a station. What do we do here?